Can I use my iMac as an extended monitor for my MacBook Pro?
I have a new MacBook Pro, how can I use my old iMac as a second monitor? What type of cable do I need?
MacBook Pro 15”, macOS 10.15
Note: Target Display Mode isn’t supported on iMac models with Retina display. Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) support Target Display Mode.
https://support.apple.com/guide/mac-help/use-an-imac-as-a-display-mh30822/mac
